﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Example05_CSharp
{
    class CPolygon
    {
        protected int width, height;
        public CPolygon(int a)
        {
            width = a;
        }
        public void SetValues(int a, int b)
        {
            width = a;
            height = b;
        }
    }
    class CRectangle : CPolygon
    {
        public CRectangle(int w, int h)
            : base(w)
        {
            height = h;
        }
        public int area()
        {
            return (width*height);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            CRectangle rect = new CRectangle(8, 9);
            Console.WriteLine("rect a:{0}",rect.area());
        }
    }
}
